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| 245 | .. |
| 246 | .TH Tk_AllocCursorFromObj 3 8.1 Tk "Tk Library Procedures" |
| 247 | .BS |
| 248 | .SH NAME |
| 249 | Tk_AllocCursorFromObj, Tk_GetCursor, Tk_GetCursorFromObj, Tk_GetCursorFromData, Tk_NameOfCursor, Tk_FreeCursorFromObj, Tk_FreeCursor \- maintain database of cursors |
| 250 | .SH SYNOPSIS |
| 251 | .nf |
| 252 | \fB#include <tk.h>\fR |
| 253 | .sp |
| 254 | .VS 8.1 |
| 255 | Tk_Cursor |
| 256 | \fBTk_AllocCursorFromObj(\fIinterp, tkwin, objPtr\fB)\fR |
| 257 | .sp |
| 258 | Tk_Cursor |
| 259 | \fBTk_GetCursor(\fIinterp, tkwin, name\fB)\fR |
| 260 | .sp |
| 261 | Tk_Cursor |
| 262 | \fBTk_GetCursorFromObj(\fItkwin, objPtr\fB)\fR |
| 263 | .VE |
| 264 | .sp |
| 265 | Tk_Cursor |
| 266 | \fBTk_GetCursorFromData(\fIinterp, tkwin, source, mask, width, height, xHot, yHot, fg, bg\fB)\fR |
| 267 | .sp |
| 268 | CONST char * |
| 269 | \fBTk_NameOfCursor(\fIdisplay, cursor\fB)\fR |
| 270 | .sp |
| 271 | .VS 8.1 |
| 272 | \fBTk_FreeCursorFromObj(\fItkwin, objPtr\fB)\fR |
| 273 | .VE |
| 274 | .sp |
| 275 | \fBTk_FreeCursor(\fIdisplay, cursor\fB)\fR |
| 276 | .SH ARGUMENTS |
| 277 | .AS "unsigned long" *pixelPtr |
| 278 | .AP Tcl_Interp *interp in |
| 279 | Interpreter to use for error reporting. |
| 280 | .AP Tk_Window tkwin in |
| 281 | Token for window in which the cursor will be used. |
| 282 | .VS 8.1 br |
| 283 | .AP Tcl_Obj *objPtr in/out |
| 284 | Description of cursor; see below for possible values. Internal rep will be |
| 285 | modified to cache pointer to corresponding Tk_Cursor. |
| 286 | .AP char *name in |
| 287 | Same as \fIobjPtr\fR except description of cursor is passed as a string and |
| 288 | resulting Tk_Cursor isn't cached. |
| 289 | .VE |
| 290 | .AP "CONST char" *source in |
| 291 | Data for cursor cursor, in standard cursor format. |
| 292 | .AP "CONST char" *mask in |
| 293 | Data for mask cursor, in standard cursor format. |
| 294 | .AP "int" width in |
| 295 | Width of \fIsource\fR and \fImask\fR. |
| 296 | .AP "int" height in |
| 297 | Height of \fIsource\fR and \fImask\fR. |
| 298 | .AP "int" xHot in |
| 299 | X-location of cursor hot-spot. |
| 300 | .AP "int" yHot in |
| 301 | Y-location of cursor hot-spot. |
| 302 | .AP Tk_Uid fg in |
| 303 | Textual description of foreground color for cursor. |
| 304 | .AP Tk_Uid bg in |
| 305 | Textual description of background color for cursor. |
| 306 | .AP Display *display in |
| 307 | Display for which \fIcursor\fR was allocated. |
| 308 | .AP Tk_Cursor cursor in |
| 309 | Opaque Tk identifier for cursor. If passed to \fBTk_FreeCursor\fR, must |
| 310 | have been returned by some previous call to \fBTk_GetCursor\fR or |
| 311 | \fBTk_GetCursorFromData\fR. |
| 312 | .BE |
| 313 | |
| 314 | .SH DESCRIPTION |
| 315 | .PP |
| 316 | These procedures manage a collection of cursors |
| 317 | being used by an application. The procedures allow cursors to be |
| 318 | re-used efficiently, thereby avoiding server overhead, and also |
| 319 | allow cursors to be named with character strings. |
| 320 | .PP |
| 321 | .VS 8.1 |
| 322 | \fBTk_AllocCursorFromObj\fR takes as argument an object describing a |
| 323 | cursor, and returns an opaque Tk identifier for a cursor corresponding |
| 324 | to the description. It re-uses an existing cursor if possible and |
| 325 | creates a new one otherwise. \fBTk_AllocCursorFromObj\fR caches |
| 326 | information about the return value in \fIobjPtr\fR, which speeds up |
| 327 | future calls to procedures such as \fBTk_AllocCursorFromObj\fR and |
| 328 | \fBTk_GetCursorFromObj\fR. If an error occurs in creating the cursor, |
| 329 | such as when \fIobjPtr\fR refers to a non-existent file, then \fBNone\fR |
| 330 | is returned and an error message will be stored in \fIinterp\fR's result |
| 331 | if \fIinterp\fR isn't NULL. \fIObjPtr\fR must contain a standard Tcl |
| 332 | list with one of the following forms: |
| 333 | .VE |
| 334 | .TP |
| 335 | \fIname\fR\0[\fIfgColor\fR\0[\fIbgColor\fR]] |
| 336 | \fIName\fR is the name of a cursor in the standard X cursor cursor, |
| 337 | i.e., any of the names defined in \fBcursorcursor.h\fR, without |
| 338 | the \fBXC_\fR. Some example values are \fBX_cursor\fR, \fBhand2\fR, |
| 339 | or \fBleft_ptr\fR. Appendix B of ``The X Window System'' |
| 340 | by Scheifler & Gettys has illustrations showing what each of these |
| 341 | cursors looks like. If \fIfgColor\fR and \fIbgColor\fR are both |
| 342 | specified, they give the foreground and background colors to use |
| 343 | for the cursor (any of the forms acceptable to \fBTk_GetColor\fR |
| 344 | may be used). If only \fIfgColor\fR is specified, then there |
| 345 | will be no background color: the background will be transparent. |
| 346 | If no colors are specified, then the cursor |
| 347 | will use black for its foreground color and white for its background |
| 348 | color. |
| 349 | .RS |
| 350 | .PP |
| 351 | The Macintosh version of Tk supports all of the X cursors and |
| 352 | will also accept any of the standard Mac cursors |
| 353 | including \fBibeam\fR, \fBcrosshair\fR, \fBwatch\fR, \fBplus\fR, and |
| 354 | \fBarrow\fR. In addition, Tk will load Macintosh cursor resources of |
| 355 | the types \fBcrsr\fR (color) and \fBCURS\fR (black and white) by the |
| 356 | name of the of the resource. The application and all its open |
| 357 | dynamic library's resource files will be searched for the named |
| 358 | cursor. If there are conflicts color cursors will always be loaded |
| 359 | in preference to black and white cursors. |
| 360 | .RE |
| 361 | .TP |
| 362 | \fB@\fIsourceName\0maskName\0fgColor\0bgColor\fR |
| 363 | In this form, \fIsourceName\fR and \fImaskName\fR are the names of |
| 364 | files describing cursors for the cursor's source bits and mask. |
| 365 | Each file must be in standard X11 or X10 cursor format. |
| 366 | \fIFgColor\fR and \fIbgColor\fR |
| 367 | indicate the colors to use for the |
| 368 | cursor, in any of the forms acceptable to \fBTk_GetColor\fR. This |
| 369 | form of the command will not work on Macintosh or Windows computers. |
| 370 | .TP |
| 371 | \fB@\fIsourceName\0fgColor\fR |
| 372 | This form is similar to the one above, except that the source is |
| 373 | used as mask also. This means that the cursor's background is |
| 374 | transparent. This form of the command will not work on Macintosh |
| 375 | or Windows computers. |
| 376 | .TP |
| 377 | \fB@\fIsourceName\fR |
| 378 | This form only works on Windows, and will load a Windows system |
| 379 | cursor (\fB.ani\fR or \fB.cur\fR) from the file specified in |
| 380 | \fIsourceName\fR. |
| 381 | .PP |
| 382 | .VS 8.1 |
| 383 | \fBTk_GetCursor\fR is identical to \fBTk_AllocCursorFromObj\fR except |
| 384 | that the description of the cursor is specified with a string instead |
| 385 | of an object. This prevents \fBTk_GetCursor\fR from caching the |
| 386 | return value, so \fBTk_GetCursor\fR is less efficient than |
| 387 | \fBTk_AllocCursorFromObj\fR. |
| 388 | .PP |
| 389 | \fBTk_GetCursorFromObj\fR returns the token for an existing cursor, given |
| 390 | the window and description used to create the cursor. |
| 391 | \fBTk_GetCursorFromObj\fR doesn't actually create the cursor; the cursor |
| 392 | must already have been created with a previous call to |
| 393 | \fBTk_AllocCursorFromObj\fR or \fBTk_GetCursor\fR. The return |
| 394 | value is cached in \fIobjPtr\fR, which speeds up |
| 395 | future calls to \fBTk_GetCursorFromObj\fR with the same \fIobjPtr\fR |
| 396 | and \fItkwin\fR. |
| 397 | .VE |
| 398 | .PP |
| 399 | \fBTk_GetCursorFromData\fR allows cursors to be created from |
| 400 | in-memory descriptions of their source and mask cursors. \fISource\fR |
| 401 | points to standard cursor data for the cursor's source bits, and |
| 402 | \fImask\fR points to standard cursor data describing |
| 403 | which pixels of \fIsource\fR are to be drawn and which are to be |
| 404 | considered transparent. \fIWidth\fR and \fIheight\fR give the |
| 405 | dimensions of the cursor, \fIxHot\fR and \fIyHot\fR indicate the |
| 406 | location of the cursor's hot-spot (the point that is reported when |
| 407 | an event occurs), and \fIfg\fR and \fIbg\fR describe the cursor's |
| 408 | foreground and background colors textually (any of the forms |
| 409 | suitable for \fBTk_GetColor\fR may be used). Typically, the |
| 410 | arguments to \fBTk_GetCursorFromData\fR are created by including |
| 411 | a cursor file directly into the source code for a program, as in |
| 412 | the following example: |
| 413 | .CS |
| 414 | Tk_Cursor cursor; |
| 415 | #include "source.cursor" |
| 416 | #include "mask.cursor" |
| 417 | cursor = Tk_GetCursorFromData(interp, tkwin, source_bits, |
| 418 | mask_bits, source_width, source_height, source_x_hot, |
| 419 | source_y_hot, Tk_GetUid("red"), Tk_GetUid("blue")); |
| 420 | .CE |
| 421 | .PP |
| 422 | Under normal conditions \fBTk_GetCursorFromData\fR |
| 423 | will return an identifier for the requested cursor. If an error |
| 424 | occurs in creating the cursor then \fBNone\fR is returned and an error |
| 425 | message will be stored in \fIinterp\fR's result. |
| 426 | .PP |
| 427 | \fBTk_AllocCursorFromObj\fR, \fBTk_GetCursor\fR, and |
| 428 | \fBTk_GetCursorFromData\fR maintain a |
| 429 | database of all the cursors they have created. Whenever possible, |
| 430 | a call to \fBTk_AllocCursorFromObj\fR, \fBTk_GetCursor\fR, or |
| 431 | \fBTk_GetCursorFromData\fR will |
| 432 | return an existing cursor rather than creating a new one. This |
| 433 | approach can substantially reduce server overhead, so the Tk |
| 434 | procedures should generally be used in preference to Xlib procedures |
| 435 | like \fBXCreateFontCursor\fR or \fBXCreatePixmapCursor\fR, which |
| 436 | create a new cursor on each call. The Tk procedures are also more |
| 437 | portable than the lower-level X procedures. |
| 438 | .PP |
| 439 | The procedure \fBTk_NameOfCursor\fR is roughly the inverse of |
| 440 | \fBTk_GetCursor\fR. If its \fIcursor\fR argument was created |
| 441 | by \fBTk_GetCursor\fR, then the return value is the \fIname\fR |
| 442 | argument that was passed to \fBTk_GetCursor\fR to create the |
| 443 | cursor. If \fIcursor\fR was created by a call to \fBTk_GetCursorFromData\fR, |
| 444 | or by any other mechanism, then the return value is a hexadecimal string |
| 445 | giving the X identifier for the cursor. |
| 446 | Note: the string returned by \fBTk_NameOfCursor\fR is |
| 447 | only guaranteed to persist until the next call to |
| 448 | \fBTk_NameOfCursor\fR. Also, this call is not portable except for |
| 449 | cursors returned by \fBTk_GetCursor\fR. |
| 450 | .PP |
| 451 | .VS 8.1 |
| 452 | When a cursor returned by \fBTk_AllocCursorFromObj\fR, \fBTk_GetCursor\fR, |
| 453 | or \fBTk_GetCursorFromData\fR |
| 454 | is no longer needed, \fBTk_FreeCursorFromObj\fR or |
| 455 | \fBTk_FreeCursor\fR should be called to release it. |
| 456 | For \fBTk_FreeCursorFromObj\fR the cursor to release is specified |
| 457 | with the same information used to create it; for |
| 458 | \fBTk_FreeCursor\fR the cursor to release is specified |
| 459 | with its Tk_Cursor token. |
| 460 | There should be exactly one call to \fBTk_FreeCursor\fR for |
| 461 | each call to \fBTk_AllocCursorFromObj\fR, \fBTk_GetCursor\fR, |
| 462 | or \fBTk_GetCursorFromData\fR. |
| 463 | .VE |
| 464 | |
| 465 | .SH BUGS |
| 466 | In determining whether an existing cursor can be used to satisfy |
| 467 | a new request, \fBTk_AllocCursorFromObj\fR, \fBTk_GetCursor\fR, |
| 468 | and \fBTk_GetCursorFromData\fR |
| 469 | consider only the immediate values of their arguments. For |
| 470 | example, when a file name is passed to \fBTk_GetCursor\fR, |
| 471 | \fBTk_GetCursor\fR will assume it is safe to re-use an existing |
| 472 | cursor created from the same file name: it will not check to |
| 473 | see whether the file itself has changed, or whether the current |
| 474 | directory has changed, thereby causing the name to refer to |
| 475 | a different file. Similarly, \fBTk_GetCursorFromData\fR assumes |
| 476 | that if the same \fIsource\fR pointer is used in two different calls, |
| 477 | then the pointers refer to the same data; it does not check to |
| 478 | see if the actual data values have changed. |
| 479 | |
| 480 | .SH KEYWORDS |
| 481 | cursor |